1: 99 percent / Et3N / tetrahydrofuran; toluene / -5 - 20 °C 2: 1.) LiHMDS / 1.) THF, -78-0 deg C, 30 min, 2.) THF, a.) -78 deg, 30 min, b.) -78 deg C - RT, 2 h 3: NaOMe / methanol / 18 h / Heating View Scheme

1: With sulfuric acid 72 h; Reflux; 2: With sodium hydrogencarbonate in ethanol; water

lithium aluminium tetrahydride

diphenylether